The invention relates to a guide rail type wall plastering machine. The guide rail type wall plastering machine comprises a guide rail system, a plastering system and a pumping machine, wherein the plastering system is arranged on the guide rail system and can move along the guide rail system back and forth, and the pumping machine is connected with the plastering system to convey raw material. The guide rail system comprises a guide rail rod, a fixed part and a supporting part used for supporting the guide rail rod, and the fixed part is arranged on the guide rail rod and used for being fixed on a wall space; the plastering system comprises a plastering plate, a conveying pipe, a hand shank and angle adjusting devices, the conveying pipe is connected with the plastering plate and used for conveying the raw material, the hand shank is used for fixing the plastering plate, and the angle adjusting devices are arranged on the hand shank and the plastering plate. The guide rail type wall plastering machine has the following advantages of relieving manual labor of workers, reducing construction cost, improving plastering quality, being small in size, light in weight, convenient to install and transport, flexible in operation, almost capable of meeting requirements of plastering construction operation in all areas of the wall space, easy to use, high in operability, capable of accurately controlling perpendicularity and flatness of plastered faces and convenient and rapid to install and commission, and the workers can operate the equipment expertly without any experience.